SERVICE (Cont.)

Control Board (Model MHG)

FIG 53 CONTROL BOARD

Location:

The control board is located on the component mounting bracket mounted to the grinder base inside the front access panel. The bracket can be removed by loosening the two 8-32 screws securing the bracket to the grinder base.

Test Procedure:

1.Press and hold the upper right hidden button to enter the Programming menus.

2.Scroll to SERVICE TOOLS menu, and press the button under "YES".

3.Press "YES" under TEST OUTPUTS and proceed,through the menus to test the left and right gates, and the grinder motor.

4.Then scroll to the TEST FREQUENCY menu and press the button under "YES".

5.Observe the left, right and center frequency screens, they should read between 124.0 and 126.0 khz.

6.Should any of the outputs or frequency tests fail, first check the continuity of the wiring between the component and the control board. Then test the individual component before replacing the control board.

Removal and Replacement

1.Disconnect the grinder from the power supply.

2.Remove the front access panel.

3.Remove all wires from the control board termi- nals.

4.Remove the bracket and control board by remov- ing the two 8-32 screws securing the bracket to the grinder base.

5.Remove the six 8-32 screws attaching the control board the the component bracket.

6.Remove the six spacers from the old control board and discard the control board.

7.Install the six spacers to the new control board

8.Attach the control board to the component bracket using the six screws previously removed.

9.Position the bracket and control board assembly in the grinder base and secure with the two 8-32 screws.

10.Reconnect the wires to the control board.

 

J16

J8

 

 

 

 

 

 

 

J12

 

J13

 

 

 

 

J7

J9

 

 

 

 

J5

 

 

 

MOV4

 

 

 

TH3

 

 

 

MOV3

 

 

 

TH2

 

 

 

MOV2

 

 

 

TH1

 

 

 

MOV1

 

 

 

FIG 54 CONTROL BOARD TERMINALS

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Bunn G9WD, LPG-2, G2 TRIFECTA, G9-2T DBC, FPG-2 service manual Control Board Model MHG

FPG-2, G9-2T DBC, G9-2, G2 TRIFECTA, G9 specifications

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